using System;
using System.Text.RegularExpressions;
using System.CodeDom;
using Composite.Data.Validation;

namespace Composite.Validation.CustomValidators
{
    // Microsoft validation attribute
    public sealed class EmailValidatorAttribute : Microsoft.Practices.EnterpriseLibrary.Validation.Validators.ValueValidatorAttribute
    {
        protected override Microsoft.Practices.EnterpriseLibrary.Validation.Validator DoCreateValidator(Type targetType)
        {
            return new EmailValidator();
        }
    }

    public sealed class EmailValidator : Microsoft.Practices.EnterpriseLibrary.Validation.Validator
    {
        private readonly string EMAILREGEX = @"^(\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*)$";
        public EmailValidator()
            : base("Email Validation", "Email")
        {
        }
        protected override string DefaultMessageTemplate
        {
            get { return "Email Validation"; }
        }
        // This method does the actual validation
        protected override void DoValidate(object objectToValidate, object currentTarget, string key, Microsoft.Practices.EnterpriseLibrary.Validation.ValidationResults validationResults)
        {
            string email = (string)objectToValidate;
            if (!Regex.IsMatch(email, EMAILREGEX))
            {
                LogValidationResult(validationResults, "This is not email", currentTarget, key);
            }
        }
    }

    public sealed class EmailValidatorPropertyValidatorBuilder : PropertyValidatorBuilder<string>
    {
        public override Attribute GetAttribute()
        {
            return new EmailValidatorAttribute();
        }

        public override CodeAttributeDeclaration GetCodeAttributeDeclaration()
        {
            return new CodeAttributeDeclaration(new CodeTypeReference(typeof(EmailValidatorAttribute)));
        }
    }

    public sealed class EmailValidatorContainer
    {
        /// <summary>
        /// Function to mapped to a C1 function in console
        /// </summary>
        /// <returns></returns>
        public static PropertyValidatorBuilder<string> EmailValidator()
        {
            return new EmailValidatorPropertyValidatorBuilder();
        }
    }
}